Screening apparatus



SCREENING APPARATUS Filed Jan. '21, 1933 s Sn/vpr.

A TTOR/VEZY.

Patented May 14, 1935 UNITED STATES 7 SCREENING APPARATUS Thomas Sandy, Goderich, Ontario, Canada Application January 21, 1933, Serial No.

I In Canada August 18, 1932 4 Claims.

This invention relates to screening apparatus, more I particularly a combination apparatus which has associated therewith means for continuously screening and crushing or grinding materials to a predetermined grade or fineness, and

although the invention may be applied tovarious uses, it will in the present instance be referred torock crushing and screening to which it has already been successfully adapted. Primarily, in unit form, the present invention continuously screens, elevates, crushes and rescreens materials. The screen inthis particular case performs several functions, the principle of which is the continuous elevating and screening properties, it is therefore one of the objects of the invention to provide a screening apparatus of this character which embodies means for continuously screening, elevating, crushing and recrushing materials in a machine of unit form.

Another object of the invention is to provide adevice of this character which, when in operation, conducts unscreened materials from one side of the screen to the elevating means.

A further object of the invention is to provide .25 a device of this character composed of few parts and efficient in operation and which may readily be transported from place to place and set in operation. 4

A still further object of the invention is to emv30 body in the apparatus a common collector for the screened materials from which they are conducted to a common delivery by the operation of the rotating screen. a Yet another object of the invention is to pro- :35 vide a unitary device of compact form which may be mounted on a motor vehicle and driven from the source of power required for operating the motor vehicle. 7

With the foregoing and other objects which 40 will become apparent as the description proceeds, the invention consists of the novel combination and arrangement of parts hereinafter described in detail and illustrated in the accompanying drawing in which:

Figure 1 is a front elevation of my improved screening apparatus as a whole.

Figure 2 is an end view of Figure 1.

Figure 3 is an enlarged sectional detail showing one of the carrier buckets and Figure 4 illustrates in fragmentary detail a positive drive means for the screen.

and its mounting Referring now to the details of structure and arrangement of the screening apparatus wherein chassis of a motor vehicle which I have indicated 1 like letters and numerals of reference indicate corresponding parts in the difierent views, the letter A designates the apparatus as a whole and in the main includes a rotatable screen B and a crusher C.

The crusher maybe of. any well known and 5 practical type and includes a hopper H!- and a housing ll, mountedwithin the housing are the usual crushing elements. The crusher C' as a Whole may conveniently 1 be mounted on the by the dotted lines IL or, if transportation means is unnecessary the apparatus may be mounted upon a suitable stationary platform or stand.

7, Coming now to one of the essential features of the invention, thiscomprises a rotatable screen B which includes screen M which may be of the wire mesh or perforated metallic type and provided with side walls I5. The screen is prefer,-

ably of annular formation and is mounted, as

particularly indicated in Figure 1, so as to encircle the crusher member C.

While in practice the crusher might be mounted at one side of. the screen, experiment has shown that most satisfactory and efficient results have been obtained by mounting it within the screen.

The support means for the screen comprises pairs rof grooved or fluted roller members i6 .and I! mounted on shafts I8 and I9 and provided with bearings 20 and 2|.

The rollers I 6 and I! support and rotate the screen member and may in turn be supported in any practical 'manner such as for example, brace members 22 and 23 which I. have indicated by dotted lines as connecting the bearing members with the crusher housing.

' For'practical purposes the roller members are preferably mounted on annular tracks 24 and 25 which may be of the T, angle or channel type and are positioned at the edge of the screen so as not to interfere with the screening properties thereof. Drive means for rotating the screen may be of the friction or gear type. The friction type is shown in Figure 1 while an alternative in the form of a positive type is shown in Figure 4.1

Power means for operating the screen may be taken from the power. means for operating the crusher or, when'the apparatus is mounted on a motor vehicle, energy may be taken from that source and employed to drive the necessary operative parts, Such power means would pref-- erably take positive form for example, a drive chain which in so far as the screen drive is con- 7 of the screen and preferably positioned adjacent a cuate guide member 32. the bucket passes the With this particular 7 served that as the screen rotates the angularly.

. cerned, would be connected to the gear 26 mounted on the shaft l8.

A further essential feature of the invention is the means for conducting uncrushed or partly while in this relative position efliciently perform their function, they do not interfere with the screening operation.

Normally when a bucket isempty it will, in

accordance with its position, move into engagement with the screen by gravityysuch relative position being shown by the buckets 21 and 28. Then, as the buckets move upwardly with the rotation of the screen, they are prevented irom responding to gravitational movement by an ar- Immediately however, extremity of the guide, the pivotal mounting andforce of gravity'will cause the bucket to'dump the contents thereof into the'hopper ltL thus the buckets continuously fill with larger sized rock or materials which are conveyed or carried upwardly and automatically dumpsuch contents into the hopper for crushing or re-crushing, the screening meantime is' continuously in operation. 1

The material carrying buckets 21, 28 and 29 hereinbefore referred to have been mentioned as gravitationally operable bucketshowever it-will be clearly understoodthat buckets oi the mechanical or positive dump type may be substituted fcrfsuch type orarrangement without departing from the spirit of the invention.

In addition to the means for carrying the materials from the base of the screen tothe crusher member, I provide means for causing unscreened materials to so move that during the rotation of the screen they are carried from one side of the screen to the other in such a manner that the dump bucket is automatically filled by the rotation of the screen. This automatic bucket filling means comprises angularly. disposed plate or bar members 21a mounted on the inner face the open or filling end of the" respective buckets.

arrangement it will be obisposed members 21a will be engaged .by' the unscreened rocks or like materials within the screen and thus readily conducted toward and into the bucket members. e v a Positioned at the base of the screen and situated therebeneath is an arcuate trough 33. This.

trough is adapted to receive the materials which have been screened during the rotative movement of screen B.

Cooperating with'the trough member are a V series of vanes or blade members 34 which are mounted around the periphery 'of the screen and preferably of 'substantially'scoop shape. Itwill be readily observed by reference to the drawing that as the screen is rotated the blade members 34 travelling through the trough 33 will carry the screened materials therefrom and such 'materialsmay then be dumped upon an endless ..V belt or the like. 35 when it is elevated for wagon loading or otherwise removed.

- The conduction of uncrushed rock or other materials tothe screen in the first instance may take any practical form and Ihave indicated in dium the uncrushed materials are carried to the screen from a source of supply.

In operation, the crusher is set in motion and the screen in rotative movement. Uncrushed rock, gravel or the like is then fed to the interior base of the screen. As the screen rotates the finer materials will be automatically screened, the larger and heavier" materials not passing through :the screen are carried over to one side and picked .up by the buckets 21, 28 and 29 and carried upwardly to be automatically dumped in the crusher hopper. tinuous operation crushes and discharges the crushed materials directly to' the base of the screen where it is a continuous screening, elevating, vcrushing and re-screening operation. As the operation continues the blade members 34 mounted on the periphery of the. screen, carry the screened material from the trough 33 to a' suitable conveyance The crusher being in confurther screened,'thus there is which may take theformof an endless belt, buckj sign and many apparently widely difi'erent embodiments of the invention constructed without 5 departing from the spirit or scope thereof. It

is intended therefore, that all matter contained herein shall be'interpreted as illustrative rather than in a limitative sense. I

What I claim as my invention is 1. Screening apparatus for continuously screening and crushing materials comprising a 1'0- tatably mounted screen,1a crushing device coe operatively associated with the screen, aseries of carrierbuckets pivotally supported within-the screen/guide means for retaining the carrier buckets and regulating the dumping movement thereof and trough means for collecting the screened materials. 1

2. Screening apparatus of character described for continuously screening and crushing materials comprising arotatably'mounted screen, a; crushing device 1ocatedwithin the screen and provided with a hopper, a series of carrier buckets associated with the screen extending to a point less than bers associatedwith the periphery of the screen H V the width of the screen and in radial alignment with the crusher hoppenguide means for regulating the upward movement of for discharging screened materials from the.

trough and means'for rotatably supporting the screen. I p p r 3. In screening apparatus of the character described for continuously screening and-crushing materials, a rotatable screen, a crushing device mounted for operation within the screen, means carried by the screen for conducting'r'naterials, to and automatically porting th'e'screen and means for automatically guiding unscreened' materials conducting materials to the crusher device.

dumping them into the crusher device, supportmeansiorrotatablysupto the .means for 4. Screening apparatus of the character described for continuously'screemng andcrushing materials comprising a rotatably mounted screen and a receiver for oversize materials, a series of pivotally mounted bucket members carried by the screen and adapted to conduct materials to the said receiver, guide means for regulating the dumping movement of filled carrier buckets, trough means for collecting the screened materials and means for discharging the screened materials from the trough.

THOMAS SANDY. 

